I don't understand where you get the idea that the desire to make a "substantial" profit is somehow "new" or "different". What company doesn't want to increase its profits? I watched a documentary that said Louis B. Mayer was at one time the highest paid executive in the country. That tells me MGM had VERY "substantial" profits at that time. They didn't make movies to lose money, or make "unsubstantial" profits.
Also, unless you have access to Sony's and TT's books, how do you know how much profit (or loss) they make on BR releases? How do you know what the demand curve looks like (ie how do you know many more copies they'd sell at a lower price point) for a given release? What's your idea of a "substantial" or "justified" profit, and why should these companies share your thinking on the subject?
It really doesn't make sense to base a purchasing decision based on how much one thinks a company "will" or "should" profit from it. It's much more sensible to answer the simple question: Is this product worth (to yourself and ONLY yourself) the price being charged? Let THEM worry about how many people will answer "yes" or "no".